Type-bar mechanism for type-writers.



H. MOYA. TYPE BAR MECHANISM FOR TYPE WRITERS.

- APPLIG A T T 0 N F I l B D J A N 3 0 1 9 1 3.

1,076,602. I I Patented 0t.21,1913.

specification of Eetters Pa ant.

i oraiea EWING-TOE, ENGLAND, ASSIGNQR T0 IMPERIAL TYPE- ?HMPLM if LIMIYEEFQ, 9F NQRTH EV'INGION ENGLAND.

"E -BAR, MEGHANISM FOE TYPE-WRITERS.

Patented (lot. 23, 1913.

finalisation filed January 36, 1913. Serial No. 7 251178.

To all 107mm may concern y do it known that l, Ermine MoYA, a citizen. of the United States of America, residing at North Evington, Leicester, England,

have invented certain new anduseful Improvements in Typediar Mechanism for A 's, of which the following is a specificati n.

This invention is for improvements in or rel 11;" to t 'pe bar mecha in fortype writ and has particuiar rel *ence to typebar 11 :chanism wherein the type-bars are operated by floating bell-crank levers, that is, levers which are neither definitely pivoted nor definitely guided in fined guides, but are free to turn and move up and down and are supported in their normal position by the moving parts of --the apparatus. Such a type-bar mechanism comprises a. type-bar pivoted to the frame of the machine and having a recess on that side remote from the face which carries the type, which recess is situated close to the pivot. The key-lever is of l ell-crank and has at one end w tits into this i c two s: i i P) .ept together by a spring, and the key-lever being further guided by the frame of the machine and by a pivot-pin operating in a slot. The recess is a comparatively shallow one so that the enlarged end of the key-lever can easily be enteredinto it; without any lateralmovemost being n cessary, so that the two parts are not POSlll' engaged but are kept together by the spring.

The object of the present invention is to so'arrangc this type of mechanism that the type-bar and key-lever shall at least be positively engaged when the latter is approximately at the end of its down-stroke.

in the accompanying drawings:l igure 1 shows diagrammatically the form of type-bar mechanism constructed according to the present invention, the parts being in raised position; Fig. 2 shows the parts of Fig. 3 just before the key-lever reaches the end of its down-stroke, and Fig. 3 shows the full striking position with the key-lever at the end of its down-stroke.

Like letters indicate like parts throughout the drawings.

In the old form, the type bar was provided with a recess in which a circular enlarged end of the type bar lever rested. The two parts were kept together by means of a spring and the base of the type bar was so shaped that it was quite free in all positions cf the arm on the 'key lever, which was employed to operate the universal bar or its equivalent. In the accompanying drawings, 1 have shown a construction in which the arm E on the key-lever E has the lower part E on that side which is toward the type-bar, so shaped that its end portion presents a face that corresponds to the arc of a circle struck from the center of the circular enlargement E whereby the key-lever is in operative engagement with the type-bar F. The type-bar has in it a recess F to receive the enlargement E as before, and the two' parts are kept together by a spring G. The type-bar is pivoted to the frame at H and the key-lever is slotted at H to receive a pin H which is also carried by the frame. The type-bar and key-lever of course are both held in place against lateral displacement by the usual frame members, and it. will be observed that the key-lever while it can be depressed bodily, also swings about the pin H after the manner of a bell-crank lever. This construction, however, forms no part of the present invention which relates entirely to the means for preventing disengagement of the part E from the recess F. It will be seen that this recess is somewhat shallow so that the parts can be easily assembled without having to introduce one into the other by a lateral movement, and by shaping the face E in the manner stated and correspondingly shaping the face F which lies to the back of the recess F the faces E F can be made to engage so that displacement from the recess F is impossible after the type-bar has been advanced a given distance.

In Fig. 2 the position is shown in which the faces E i come into operative position, and it will be seen that when in this position they both he suliiciently behind the recess F to positively hold the enlargement E in it, and this position is still further insured when the hey-leverE is depressed to its full limit as shown in F 5 and the type-bar is striking the platen J.

The action may be more fully described as followstlfhe pin H constitutes apivot for the key-lever E, which pivot is situated between the key-carrying end and the operative end; this latter may be described as bifurcated, one fork of the bifurcation having on it the enlargement E and lying tofork being provided with the chrved surface 131" which cooperates with the corre% spondingly curved surface F on the heel'of the type-bar F and lies towardthe other side of the pivot H. The surface "E as will be seen facesin the direction in which the kelever E'must be displaced to dislodge tlie enlargement E from the recess 15, so that any tendency to so displace the key-lever causes'theface E 'to bear. against the face- The face F however, cannot be displaced owing to the pivot H being fixed relatively to the frame, so that the face F being in this manner interposed between the recess F and the face E positively locks the key-lever against such displacement as would dislodge the enlargement E from the recess.

It is' found that when the type-bar strikes the platen, somewhat heavily, and the finger of the operator has been released from the key-lever IE, it required a somewhat stiff spring G to prevent the enlargement E from being bounced out of the recess F of the type-bar. This is quite impossible in a construction invention as the connection between the two parts at the moment of the type-bar striking I to secure by I the key-lever against displacement in a dibar and key-lever, and vent displacement of rection to carry the enlargement out from the recess when the type-bar is nearing the end of its stroke, for'the purpose described.

2. In a typewriter, the combination of a type -bar pivoted onthe frame of the machine, a floating bell-crank key-lever having at one end a circular enlargement which engages a segmental recess in the type bar to operate it, a spring connecting the type guiding means to prethe key lever in a direction to carry its enlargement out from the recess in the type bar when the parts are near the position occupied at the end of the stroke and which are so disposed that they only come into operation toward the I end of the stroke, for the purpose described.

chine, a

v 3. In a typewriter, the combination of a type-bar pivoted on the frame ofthe mafioating bell-crank key-lever having at one end a circular enlargement which engages the segmental recess in the type-bar,

built in accordance with mya spring connecting the type-bar and keylever, and an arm on the key-lever having a curved guiding surface facing the direction in which movement of the key-lever would tendyto carry its enlargement out from the recess in the type-bar, the curve of this face conforming to part of a circle struck from the center of pivoting of the enlargement, said surface cooperating with a part barwhen the key-lever and the type-bar are in the positions they occupy toward the end of the stroke, for the purpose described.

4. In a typewriter, the combination of a type-bar pivoted on the frame of the machine, a floating bell-crank key-lever having at one end a circular enlargement which engages a segmental recess in the type-bar, a spring connecting the. lever, and an arm on the key-lever having a curved guiding surface facing the direction in which movement of the key-lever would tend to carry its enlargement out from the recess in the type-bar, the curve of this face conforming to part of a circle struck from the center of pivoting of the enlargement, the type-bar having a cooperating surface which lies between the recess and the curved guiding surface of the key-lever arm when the key-lever and type-bar, are in the posi tions they occupy toward the end of the stroke, for the purpose described.

5. In a typewriter, the combination of a type-bar pivoted by one end on the frame of the machine, a floating bell-crank keylever having. that end remote from the key bifurcated, one of the forks so provided having at its ends a circular enlargement which engages the segmental recess in the type-bar and lies toward one side of the pivot therefor while the other forklies toward the'opposite side of the pivot, a spring connecting the type-bar and key-lever, the inner face of the key-lever fork which does not carry the circular enlargement being curved to an arc of a circle struck from the center ofthe enlargement and the type-bar being provided with a'heel on the side opposite the recess so placed that as the typebar nears the end of its stroke the said heel comes into sliding contact with the curved face on the key lever fork and prevents displacement of the key-lever in a direction which would carry the circular enlargement out from the recess, for the purpose scribed.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

- I HIDALGO MOYA.

Witnesses:

Gno. WM. Hossms, FRED W. DAWSON.

type-bar and keywhich lies between it and the recess in the type-- 

